Mark Wilden wrote:
> My favourite (sic) is the British use of the possessive for no reason:
> "We're going to Tesco's". :)

I think you'll find it's short for "We're going to Tesco's [store]".

Similar in principle to "We met up at Fred's [house]" or "Homer is often 
to be found in Moe's [bar]".

A fairly recent usage is the possessive pronoun for a similar purpose: 
"After dinner we went back to hers" meaning "...back to her place".
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